Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc29755c4f9b9fd…

MALICIOUS

PDF

76.3 KB Created: 2021-02-23 21:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e1ffbde4f8e691156b1eb8700f50e4e3 SHA-1: cca25a0f061073549e5b8d6e2359aed09373981f SHA-256: dfc29755c4f9b9fd05253af2d7d8572a5df700e7bbab90b9de2a0e427d81afab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL suggests an attempt to redirect the user to a harmful site, likely for phishing or to download a secondary payload. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/wix?keyword=jonathan+bowden+death In PDF document text
    • https://static.s123-cdn-static.com/uploads/4403689/normal_5ff2ffa4533f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5fdb7dd98581b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481985/normal_6011208e71835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_5fe68790af9d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368240/normal_5fe2d966849f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_5fe9ea98f215e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454056/normal_5fd7dc19897f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496810/normal_5ff3e4d45bbfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/nolimizevofexabozikod.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/burnout_paradise_pc_full_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/apprentice_completion_grant_form.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/56602888200.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/teacher_resume_template_with_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/free_action_cartoon_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/mokuwakimewibirexemajove.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/61936036098.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/29584781783.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/dowixazinegajelewi.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/betileragitudelofesudi.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/30714599398.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 4828 bytes
SHA-256: 15e0302537ea5d54d39595fec5d6346af3961e6680ef904c8f0c95deb573cfcc
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 11100 bytes
SHA-256: 5e962b1b8b97e3eb8017709bebb33b125c3e32b68f008dc9b92556d9180d1501

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